What Causes Vomiting Sensation After Eating Fruits?

Hello!After I eat a piece of orange, my body immediately induces a vomit attack: my heart begins to race, my saliva glands begin to over-produce, and I have to run to the bathroom to throw up. This reaction happens within a minute of me eating it. It s been going on for about 5 years now. I ve since then stopped eating oranges all together, which sucks. Every now and then I ll think maybe I can have one slice but it always ends the same way: with lunch in the toilet. Now it s starting to happen with other fruits: strawberries, avacados... My list is growing and I m starting be afraid of eating any kind of fruit.I looked up oral allergy syndrome, but most of those symptoms are itchiness and hives around the mouth and skin. I don t get any of those symptoms, I just get nauseous and throw up. But I feel completely fine afterwards.What s wrong with me and fruit? Any insight would be greatly appreciated! Thanks for your help!